Originally Posted by Bill M.
something wrong in the setup. City water pressure should not get to the pump. There is supposed to be a check valve between the pump and the water system so that water can flow from the pump into the system but not back from the system into the pump.
Do you think that maybe the check valve needs replacement? the diagram shows the check valve right before the Pressure Regulator, but I have not seen it.
I hope that is the problem.. the next question is - if the check valve didn't do its job, did I ruin the pump? I am going to change the pump anyways.. its 30 years old and bound to die sooner rather than later, and might as well change the check valve while I am at it.